我试图从照片库中提供用户对图像的选择。因此，我使用UIImagePickerController进行选择。但是这里出现了在文件系统中获取其初始URL的问题（我需要CKAsset）。
我的代码。
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
let path = imageURL.path!
let imageName = path.lastPathComponent
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentDirectory = paths.first as String!
let localPath = documentDirectory + "/" + imageName
let imageData = NSData(contentsOfFile: localPath)!
let image = UIImage(data: imageData)!
picker.dismissViewControllerAnimated(true, completion: nil)
}
imageURL 有点神秘。它描述了资产URL，但不是文件系统中的资产URL。它看起来像是：assets-library://asset/asset.JPG?id=B6C0A21C-07C3-493D-8B44-3BA4C9981C25&ext=JPG。
根据此逻辑，路径为/asset.JPG，其中asset.JPG是图片的名称。
然后我访问了我的Documents文件夹并试图找到一个带路径的文件：
/Users/Eugene/Library/Developer/CoreSimulator/Devices/3C5E9A23-8220-4B37-BD14-F1E42EEC2C7C/data/Containers/Data/Application/20EBAAE2-6C6F-4651-A48F-16A222CCB3A2/Documents/asset.JPG < / p>
也是隐秘的，但似乎是不存在的图像的真实路径......没有找到具有该路径的图像。这让我感到恶心。
我是否必须从头开始保存图像？或者还有其他方法吗？
我已经使用 AssetsLibrary API查看了几个教程，但我找不到任何有用的方法来解决我的问题。提前谢谢！
答案 0 :(得分：30)
好的，我已经解决了这个问题。
您只需抓取图像（info[UIImagePickerControllerOriginalImage] as UIImage）并保存到给定目录即可。如果你只需要保存1张图片就可以了。代码ID如下。
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
let imageName = imageURL.path!.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String
let localPath = documentDirectory.stringByAppendingPathComponent(imageName)
let image = info[UIImagePickerControllerOriginalImage] as UIImage
let data = UIImagePNGRepresentation(image)
data.writeToFile(localPath, atomically: true)
let imageData = NSData(contentsOfFile: localPath)!
let photoURL = NSURL(fileURLWithPath: localPath)
let imageWithData = UIImage(data: imageData)!
picker.dismissViewControllerAnimated(true, completion: nil)
}
答案 1 :(得分：7)
在 SWIFT 4 中你可以尝试一下，它正常工作。
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let imgUrl = info[UIImagePickerControllerImageURL] as? URL{
let imgName = imgUrl.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
let localPath = documentDirectory?.appending(imgName)
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
let data = UIImagePNGRepresentation(image)! as NSData
data.write(toFile: localPath!, atomically: true)
//let imageData = NSData(contentsOfFile: localPath!)!
let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
print(photoURL)
}
APPDEL.window?.rootViewController?.dismiss(animated: true, completion: nil)
}
答案 2 :(得分：4)
compose答案 3 :(得分：2)
检查此解决方案。
import AssetsLibrary
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
self.imagePicker = picker
if let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
let controller = CropViewController(image: selectedImage )
controller.delegate = self
picker.presentViewController(controller, animated: true, completion: nil)
}
else if let imageUrl = info[UIImagePickerControllerReferenceURL] as? NSURL{
let assetLibrary = ALAssetsLibrary()
assetLibrary.assetForURL(imageUrl , resultBlock: { (asset: ALAsset!) -> Void in
if let actualAsset = asset as ALAsset? {
let assetRep: ALAssetRepresentation = actualAsset.defaultRepresentation()
let iref = assetRep.fullResolutionImage().takeUnretainedValue()
let image = UIImage(CGImage: iref)
let controller = CropViewController(image: image)
controller.delegate = self
picker.presentViewController(controller, animated: true, completion: nil)
}
}, failureBlock: { (error) -> Void in
})
}
}
答案 4 :(得分：2)
对于Swift 5+，根据@Jaydip答案
if let imgUrl = info[UIImagePickerController.InfoKey.imageURL] as? URL{
let imgName = imgUrl.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
let localPath = documentDirectory?.appending(imgName)
let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
let data = image.pngData()! as NSData
data.write(toFile: localPath!, atomically: true)
//let imageData = NSData(contentsOfFile: localPath!)!
let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
print(photoURL)
}
答案 5 :(得分：1)
快速4
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let imgUrl = info[UIImagePickerControllerReferenceURL] as? URL{
let imgName = imgUrl.lastPathComponent
let documentDirectory = NSTemporaryDirectory()
let localPath = documentDirectory.appending(imgName)
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
let data = UIImageJPEGRepresentation(image, 0.3)! as NSData
data.write(toFile: localPath, atomically: true)
let photoURL = URL.init(fileURLWithPath: localPath)
}
}
答案 6 :(得分：1)
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
//obtaining saving path
let fileManager = FileManager.default
let documentsPath = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first
let imagePath = documentsPath?.appendingPathComponent("image.jpg")
// extract image from the picker and save it
if let pickedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
let imageData = pickedImage.jpegData(compressionQuality: 0.75)
try! imageData?.write(to: imagePath!)
}
}
谢谢
答案 7 :(得分：0)
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:4000/api/users/register. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).[Learn More]
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:4000/api/users/register. (Reason: CORS request did not succeed).